Currently, Mystic Credo can ask you to trigger a specific Experience event, which is bad game design because the whole experience event system is supposed to be obfuscated.(1)
Instead, it could ask you following things to still keep up the "Experience event" -theme going:
*Earn certain amount of Experience points from events.
*Trigger an event that gives X or more xp.
1: Current rendering displays ever lore event in alphabetical order, giving no clue how long it has been since you last triggered it. Old rendering (or at least Ardennes client) displays the lores in the order from most recently triggered to last one to have triggered (meaning the character creation events are always at the bottom, unless you trigger the willow event in the Creation Room.)